I used to use Python/C/OCaml which all didn't necessarily play well together. Python and OCaml both expect their own runtimes.
Now I use Python/Rust. Rust covers the C and OCaml use cases well enough and plays very well with Python.
Python is a nice high-level language that is somewhat slow and gets messy with larger projects. However, falling back to a compiled language that can generate Python libraries makes Python(3) really hard to beat.
Python&C++ or Python&Rust are probably most viable going forward.
By the numbers, Python is currently #1 most popular language AND gaining most % use on Github: pypl.github.io/PYPL.html
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